const autoprefixer = require("autoprefixer");
const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
const eslintFormatter = require("react-dev-utils/eslintFormatter");
const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");

const getClientEnvironment = require("./env");
const paths = require("./paths");
// 自定义模块
const modules = require("./modules");

// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = "/";
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = "";
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);

// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
    // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
    // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
    devtool: "cheap-module-source-map",
    // These are the "entry points" to our application.
    // This means they will be the "root" imports that are included in JS bundle.
    // The first two entry points enable "hot" CSS and auto-refreshes for JS.
    entry: [
        // Include an alternative client for WebpackDevServer. A client's job is to
        // connect to WebpackDevServer by a socket and get notified about changes.
        // When you save a file, the client will either apply hot updates (in case
        // of CSS changes), or refresh the page (in case of JS changes). When you
        // make a syntax error, this client will display a syntax error overlay.
        // Note: instead of the default WebpackDevServer client, we use a custom one
        // to bring better experience for Create React App users. You can replace
        // the line below with these two lines if you prefer the stock client:
        // require.resolve('webpack-dev-server/client') + '?/',
        // require.resolve('webpack/hot/dev-server'),
        require.resolve("react-dev-utils/webpackHotDevClient"),
        // We ship a few polyfills by default:
        require.resolve("./polyfills"),
        // Errors should be considered fatal in development
        require.resolve("react-error-overlay"),
        // Finally, this is your app's code:
        paths.appIndexJs
        // We include the app code last so that if there is a runtime error during
        // initialization, it doesn't blow up the WebpackDevServer client, and
        // changing JS code would still trigger a refresh.
    ],
    output: {
        // Next line is not used in dev but WebpackDevServer crashes without it:
        path: paths.appBuild,
        // Add /* filename */ comments to generated require()s in the output.
        pathinfo: true,
        // This does not produce a real file. It's just the virtual path that is
        // served by WebpackDevServer in development. This is the JS bundle
        // containing code from all our entry points, and the Webpack runtime.
        filename: "static/js/bundle.js",
        // There are also additional JS chunk files if you use code splitting.
        chunkFilename: "static/js/[name].chunk.js",
        // This is the URL that app is served from. We use "/" in development.
        publicPath: publicPath,
        // Point sourcemap entries to original disk location (format as URL on Windows)
        devtoolModuleFilenameTemplate: info =>
            path.resolve(info.absoluteResourcePath).replace(/\\/g, "/")
    },
    resolve: {
        // This allows you to set a fallback for where Webpack should look for modules.
        // We placed these paths second because we want `node_modules` to "win"
        // if there are any conflicts. This matches Node resolution mechanism.
        // https://github.com/facebookincubator/create-react-app/issues/253
        modules: ["node_modules", paths.appNodeModules].concat(
            // It is guaranteed to exist because we tweak it in `env.js`
            process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
        ),
        // These are the reasonable defaults supported by the Node ecosystem.
        // We also include JSX as a common component filename extension to support
        // some tools, although we do not recommend using it, see:
        // https://github.com/facebookincubator/create-react-app/issues/290
        // `web` extension prefixes have been added for better support
        // for React Native Web.
        extensions: [
            ".web.js",
            ".js",
            ".json",
            ".web.jsx",
            ".jsx",
            ".ts",
            ".tsx",
            ".(css|less)"
        ],
        alias: {
            // Support React Native Web
            // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
            "react-native": "react-native-web",
            ...modules
        },
        plugins: [
            // Prevents users from importing files from outside of src/ (or node_modules/).
            // This often causes confusion because we only process files within src/ with babel.
            // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
            // please link the files into your node_modules/ and let module-resolution kick in.
            // Make sure your source files are compiled, as they will not be processed in any way.
            new ModuleScopePlugin(paths.appSrc)
        ]
    },
    module: {
        strictExportPresence: true,
        rules: [
            // TODO: Disable require.ensure as it's not a standard language feature.
            {
                test: /\.(ts|tsx)?$/,
                loaders: ["babel-loader", "awesome-typescript-loader"],
                exclude: ["/node_modules/"]
            },
            {
                enforce: "pre",
                test: /\.js$/,
                loader: "source-map-loader"
            },
            // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
            // { parser: { requireEnsure: false } },

            // First, run the linter.
            // It's important to do this before Babel processes the JS.
            {
                test: /\.(js|jsx)$/,
                enforce: "pre",
                use: [
                    {
                        options: {
                            formatter: eslintFormatter
                        },
                        loader: require.resolve("eslint-loader")
                    }
                ],
                include: paths.appSrc
            },
            // ** ADDING/UPDATING LOADERS **
            // The "file" loader handles all assets unless explicitly excluded.
            // The `exclude` list *must* be updated with every change to loader extensions.
            // When adding a new loader, you must add its `test`
            // as a new entry in the `exclude` list for "file" loader.

            // "file" loader makes sure those assets get served by WebpackDevServer.
            // When you `import` an asset, you get its (virtual) filename.
            // In production, they would get copied to the `build` folder.
            {
                exclude: [
                    /\.html$/,
                    /\.(js|jsx)$/,
                    /\.css$/,
                    /\.less$/,
                    /\.ts$/,
                    /\.json$/,
                    /\.bmp$/,
                    /\.gif$/,
                    /\.jpe?g$/,
                    /\.png$/
                ],
                loader: require.resolve("file-loader"),
                options: {
                    name: "static/media/[name].[hash:8].[ext]"
                }
            },
            // "url" loader works like "file" loader except that it embeds assets
            // smaller than specified limit in bytes as data URLs to avoid requests.
            // A missing `test` is equivalent to a match.
            {
                test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
                loader: require.resolve("url-loader"),
                options: {
                    limit: 10000,
                    name: "static/media/[name].[hash:8].[ext]"
                }
            },
            // Process JS with Babel.
            {
                test: /\.(js|jsx)$/,
                include: paths.appSrc,
                loader: require.resolve("babel-loader"),
                options: {
                    plugins: [
                        ["import", {libraryName: "antd", style: true}],
                        "transform-class-properties",
                        "transform-decorators-legacy",
                        "transform-decorators",
                        "transform-async-to-generator",
                        "transform-react-jsx",
                        "transform-do-expressions",
                        "syntax-do-expressions",
                        "transform-object-rest-spread",
                        "transform-function-bind",
                        "transform-object-assign",
                        "transform-runtime"
                    ],
                    // This is a feature of `babel-loader` for webpack (not Babel itself).
                    // It enables caching results in ./node_modules/.cache/babel-loader/
                    // directory for faster rebuilds.
                    presets: [["env", {modules: false}]],
                    cacheDirectory: true
                }
            },
            // "postcss" loader applies autoprefixer to our CSS.
            // "css" loader resolves paths in CSS and adds assets as dependencies.
            // "style" loader turns CSS into JS modules that inject <style> tags.
            // In production, we use a plugin to extract that CSS to a file, but
            // in development "style" loader enables hot editing of CSS.
            {
                test: /\.css$/,
                use: [
                    require.resolve("style-loader"),
                    {
                        loader: require.resolve("css-loader"),
                        options: {
                            importLoaders: 1
                        }
                    },
                    {
                        loader: require.resolve("postcss-loader"),
                        options: {
                            // Necessary for external CSS imports to work
                            // https://github.com/facebookincubator/create-react-app/issues/2677
                            ident: "postcss",
                            plugins: () => [
                                require("postcss-flexbugs-fixes"),
                                autoprefixer({
                                    browsers: [
                                        ">1%",
                                        "last 4 versions",
                                        "Firefox ESR",
                                        "not ie < 9" // React doesn't support IE8 anyway
                                    ],
                                    flexbox: "no-2009"
                                })
                            ]
                        }
                    }
                ]
            },
            {
                test: /\.less$/,
                use: [
                    require.resolve("style-loader"),
                    require.resolve("css-loader"),
                    {
                        loader: require.resolve("postcss-loader"),
                        options: {
                            ident: "postcss", // https://webpack.js.org/guides/migrating/#complex-options
                            plugins: () => [
                                require("postcss-flexbugs-fixes"),
                                autoprefixer({
                                    browsers: [
                                        ">1%",
                                        "last 4 versions",
                                        "Firefox ESR",
                                        "not ie < 9" // React doesn't support IE8 anyway
                                    ],
                                    flexbox: "no-2009"
                                })
                            ]
                        }
                    },
                    {
                        loader: require.resolve("less-loader"),
                        options: {
                            javascriptEnabled: true,
                            modifyVars: {
                                "@primary-color": "#00B2FB",
                                "@app": process.env.Z_CSS_PREFIX
                            }
                        }
                    }
                ]
            }
            // ** STOP ** Are you adding a new loader?
            // Remember to add the new extension(s) to the "file" loader exclusion list.
        ]
    },
    plugins: [
        // Makes some environment variables available in index.html.
        // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
        // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
        // In development, this will be an empty string.
        new InterpolateHtmlPlugin(env.raw),
        // Generates an `index.html` file with the <script> injected.
        new HtmlWebpackPlugin({
            inject: true,
            template: paths.appHtml
        }),
        // Add module names to factory functions so they appear in browser profiler.
        new webpack.NamedModulesPlugin(),
        // Makes some environment variables available to the JS code, for example:
        // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
        new webpack.DefinePlugin(env.stringified),
        // This is necessary to emit hot updates (currently CSS only):
        new webpack.HotModuleReplacementPlugin(),
        // Watcher doesn't work well if you mistype casing in a path so we use
        // a plugin that prints an error when you attempt to do this.
        // See https://github.com/facebookincubator/create-react-app/issues/240
        new CaseSensitivePathsPlugin(),
        // If you require a missing module and then `npm install` it, you still have
        // to restart the development server for Webpack to discover it. This plugin
        // makes the discovery automatic so you don't have to restart.
        // See https://github.com/facebookincubator/create-react-app/issues/186
        new WatchMissingNodeModulesPlugin(paths.appNodeModules),
        // Moment.js is an extremely popular library that bundles large locale files
        // by default due to how Webpack interprets its code. This is a practical
        // solution that requires the user to opt into importing specific locales.
        // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
        // You can remove this if you don't use Moment.js:
        new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
    ],
    // Some libraries import Node modules but don't use them in the browser.
    // Tell Webpack to provide empty mocks for them so importing them works.
    node: {
        dgram: "empty",
        fs: "empty",
        net: "empty",
        tls: "empty"
    },
    // Turn off performance hints during development because we don't do any
    // splitting or minification in interest of speed. These warnings become
    // cumbersome.
    performance: {
        hints: false
    }
};
